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Analytical Sensitivity**How To Calculate Analytical
Sensitivity For Analyses Conducted at Prestige
EnviroMicrobiology, Inc. **

**For spore
counting (P001)**, the analytical sensitivity is: 1/area read (or area
read in %, then times 100)/air volume in m^{3}.

Example: the analytical sensitivity for
Air-O-Cell with an air volume of 0.15 m3 is: 1/25.3 x 100/0.15
m^{3} = 26 fungal structures/m^{3}. **For
culturable air samples (P006, P007 and P008)**, the analytical
sensitivity is: 1/air volume in m^{3}.

Example: the analytical sensitivity for Andersen
samples with an air volume of 141.5L or 0.1415 m^{3} is:
1/0.1415 = 7 CFU/m^{3}. **For culturable bulk &
dust samples (P009 thru P017)**, the analytical sensitivity is: 1 x

100x (lowest dilution used in the analysis, usually 100x; if dust
weight is less than 0.075g,

use 40x) then divided by weight
used.

Example: the analytical sensitivity of
a bulk sample with 0.1250g used, the analytical sensitivity is: 1 x
100 / 0.125g = 800 CFU/g.

Example: the
analytical sensitivity of a dust sample with 0.0500g used, the
analytical sensitivity is: 1 x 40 / 0.0500g = 800 CFU/g.

Example: the analytical sensitivity of a dust
sample with no measurable weight, the analytical sensitivity is: 1 x
10 / 1 = 10 CFU/sample. **For culturable swab samples (P009
thru P017)**, the analytical sensitivity is: 1 x 100x

then
divided by sample area used. If sample area is not defined, use one.

Example: the analytical sensitivity of a swab
sample with one squared inch collected, the analytical sensitivity is:
1 x 100 / 1 = 100 CFU/in^{2}.

Example: the analytical sensitivity of a swab sample with no
collection surface area available, the analytical sensitivity is: 1 x
100 / 1 = 100 CFU/sample.

(May
2014)